jannyHous-MBP:test jannyhou$ npm ls nodemailer
test@1.0.0 /Users/jannyhou/Desktop/Nov/test
├─┬ loopback@3.27.0
│ └── UNMET DEPENDENCY nodemailer@4.7.0 (npm link somehow doesn't work ,so I remove it manually)
└── nodemailer@6.4.16

email sent! {
 accepted: [ 'juehou4102@gmail.com' ],
 rejected: [],
 envelopeTime: 243,
 messageTime: 1579,
 messageSize: 566,
 response: '250 2.0.0 OK 1606244464 t7sm13254038qti.83 - gsmtp',
 envelope: { from: 'jannyhou2015@gmail.com', to: [ 'juehou4102@gmail.com' ] },
 messageId: '<d05d4cec-103c-bcbe-5f41-a8fe2890bde3@gmail.com>'
}